It can’t be A.) because to us Muslims Paul isn’t a prophet,apostle or a big deal
It could be B.) and C.) because Moses and Jesus (PBUT) are both highly loved and respected Prophets in Islam.
But it is most likely D.) because Muhammad (PBUH) is the most important prophet. He is the ‘seal of the prophets’ because he was the last and the one who revealed the Quran - the Islamic holy book.
"Sewage treatment" would be the best example of a natural monopoly, since it is far more efficient and beneficial for society to have a single company operate this type of business.
